Agreed, you'll make a lot more by selling the aftermarket stuff, going back stock and selling it that way, even CarMax would buy it but they will actually give you less for a car with mods.. so you would probably come out pretty good by selling the mods and then selling the car for cheaper as stock.
On another note: by looking at the prices you paid for stuff.. those are pretty high.. if you did part out I doubt you would get what you paid for your mods.. and you're basically stock anyway so it would be pointless, and I guess by looking at the mods, there isn't too much that you can take off to sell. (dunno)
Is the engine a rebuilt stock engine, or is it forged? I am assuming it's stock.. I think the price is a bit too high if you really need to sell it quick.. maybe you could get that if the engine was forged, but even with all my mods I was asking a bit less for mine (which I decided to keep) and I have over $10K in just the mods, the forged engine, etc.